Door.



NITED STATES CHARLES H. CRAMER, OF MDDLEPORT, NEW YORK.

Doon.

SPECIFICATION forming part of Letters Patent No. 641,675, dated January 23, 1900.

Application led October 31, 1899. Serial No. 735,379. (No model.)

To all whom t may concern:

Be it known that I, CHARLES H. CEAMER, a citizen of the United States, residing at Middleport, in the county of Niagara and State of New York, have invented a new and useful Improvement in Doors, of which thefollowing is a specification.

The invention relates to doors which are composed of a core or body of inferior wood and facings or veneers of more Yexpensive wood, and more particularly to cored doors in which the members of the core consist of solid strips as distinguished from members which are laminated or made up of a number of thin strips glued together.

The object of my invention is the construction of a strong and inexpensive door of this kind which is not liable to warp, spring, or

twist; and to that end my invention consists, y

essentially, in providing the core on both sides or faces with grooves or depressions.

In the accompanying drawings, Figure lKis a face view of the core of my improved door. Fig. 2 is a horizontal section thereof with the veneer applied thereto.

Like letters of reference refer to like parts in both figures.

A represents the Stiles of the door body or core; B, the top and bottom rails C, the lockrail, and D D the Inuntins, each of which members preferably consists of a solid bar or strip of wood, as shown.

E is the veneering, which is glued or otherwise applied to the faces of the core, and F the facing-strips, applied to the outer edges of the stiles A.

The core of the door is provided in both of its at sides or faces with grooves or depressions g. Each member A, B, C, and D of the core is provided with such grooves, and the latter preferably extend in the direction of the grain of the wood in each member, as shown in Fig. 1. These grooves divide the faces of the core members into a number of separate narrow surfaces h, against which the veneering E bears, as shown in Fig. 2, and to which the same is glued. The grooves are not occupied by the veneerin g, but are simply covered by the same. By constructing the core so as to present numerous bearing-surfaces to the veneering instead of a continuous bearing-face the veneer eectually resists warping, springing, or twisting of the core members, producing a door which is cheaper than one having its core built up of numerous strips and which preserves its form as well as such a laminated door. This grooved construction of thecore also materially reduces the weight of the door.

I claim as my inventionl. Acored door having its core provided in its face with grooves or depressions which divide the same into separate bearing-surfaces for the venee'ring of the door, substantially as set forth.

- 2. A door composed of a core having its members provided in opposite sides with parallel grooves extending lengthwise of each member, and veneering applied to opposite sides of the grooved core and bearing against the narrow bearing surfaces between said grooves, substantially as set forth,

Witness myhand this 26th day of October,

C. H. CRAMER. Witnesses:

M. C. GRADY, WM. NEWMAN. 

